The jsbn library is a fast, portable implementation of large-number math in pure JavaScript, enabling public-key crypto and other applications on desktop and mobile browsers.
@author "Tom Wu" tjw@cs.stanford.edu http://www-cs-students.stanford.edu/~tjw/jsbn/
- RSA.modulus
:String - RSA.exponent
:String - RSA.seed()
:void - RSA.hex2Base64(str
:String):String - RSA.encrypt(str
:String, modulus:String = RSA.modulus, exponent:String = RSA.exponent):HexString - RSA.encrypt64(str
:String, modulus:String, exponent:String):Base64String
- Generate a new public/private keypair:
$ openssl genrsa -out key.pem
Generating RSA private key, 512 bit long modulus
..++++++++++++
..............++++++++++++
e is 65537 (0x10001)
- Extract the modulus from your key:
$ openssl rsa -in key.pem -noout -modulus
Modulus=DA3BB4C40E3C7E76F7DBDD8BF3DF0714CA39D3A0F7F9D7C2E4FEDF8C7B28C2875F7EB98950B22AE82D539C1ABC1AB550BA0B2D52E3EF7BDFB78A5E817D74BBDB
- Go to the RSA Encryption demo and paste the modulus value into the "Modulus (hex)" field at the bottom.
- Make sure the value in the "Public exponent" field is "10001", or whatever value your public key uses.
- Type in a short string (e.g. testing) into the "Plaintext (string)" field and click on "encrypt". The result should appear in the "Ciphertext" fields.
- Copy the base64 version of the ciphertext and paste it as the input of the following command:
$ openssl base64 -d | openssl rsautl -inkey key.pem -decrypt
1JW24UMKntVhmmDilAYC1AjLxgiWHBzTzZsCVAejLjVri92abLHkSyLisVyAdYVr
fiS7FchtI9vupe9JF/m3Kg==
Hit ctrl-D or whatever your OS uses for end-of-file. Your original plaintext should appear:
testing$